Problem Extruding backward faces with beveled edges

[mikhailkonstantin3d]

Greetings, 

i was modeling a sci fi spaceship and i got a problem i hope it can be solved, and i have attached 3 photos of it, so the thing is in the first photo you see the faces i selected that should be extruded backwards, and in the second you see the beveled edges i have painted around, so the yellow ones will be just fine, but the red ones, and because they will go back, they will have a problem like the third photo, any solution for that ? 

thank you

[Anonymous]

hi, this happend because thickness is too hight, try other options but all the same result, maybe try first do extrude then bevel if posible

[mihirsbcc]

Bevel is always done at the last. You will be better off by doing all your extrusions and then finally bevel the hard edges.